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Orifice Plates
for Flow Measurement

Restriction Orifice Unions


1/4" to 2" socket-weld or female NPT threads bored to your specifications

Product Features

• Designed for simple plate replacement
• Available in both Female NPT and socket-weld connections
• Seals will not loosen, even under extreme pressure
• Available with or without tabs for easy identification

Product Description

Restriction Orifice Unions consist of orifice plates that are one-piece stainless steel shaped to fit the contour of the union seat (ball to cone), eliminating the need for gaskets. Plates can be configured to work as recessed, pressed, or pressed with tab so you can identify the orifice size without breaking the union.

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Orifice unions are stocked in carbon & stainless steel bodies with pressure ratings of 3,000 PSIG. Restriction orifice unions are also available in line sizes from 1/4" through 2" and with female NPT or socket-weld connections. Other non-standard orifice union sizes and materials can be produced rapidly upon request.

While orifices are typically bored to your supplied sizing calculation, we can provide sizing calculation services to you for a minimal fee.

All orifice plates are stainless steel, unless otherwise requested, and can be ordered separately or incombination with our restriction orifice unions.

Orifice Plate Sizing Chart
Restriction Orifice Union Sizing Chart
Size A B C
1/4" 1 3/4" 1/4" 1 3/8"
3/8" 1 7/8" 3/8" 1 5/8"
1/2" 2" 1/2" 1 3/4"
3/4" 2 1/4" 3/4" 2 3/16"
1" 2 9/16" 1" 2 9/16"
1 1/4" 2 7/8" 1 1/4" 3 1/16"
1 1/2" 3 1/8" 1 1/2" 3 7/16"
2" 3 1/2" 2" 4"
All Sizes in Inches

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Product Specs


Orifice Plate Sizing Chart
Restriction Orifice Union Sizing Chart
Size A B C
1/4" 1 3/4" 1/4" 1 3/8"
3/8" 1 7/8" 3/8" 1 5/8"
1/2" 2" 1/2" 1 3/4"
3/4" 2 1/4" 3/4" 2 3/16"
1" 2 9/16" 1" 2 9/16"
1 1/4" 2 7/8" 1 1/4" 3 1/16"
1 1/2" 3 1/8" 1 1/2" 3 7/16"
2" 3 1/2" 2" 4"
All Sizes in Inches

Frequently Asked Questions


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